<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button id="btn">发送请求</button>
</body>
<script>
    const btn = document.getElementById('btn')
    btn.addEventListener('click',()=>{
        fetch('http://localhost:3300')
        .then((res)=>{
            console.log(res.json())
        }).then((res)=>{
            console.log(res)
        })
    })
</script>
</html>